The last few Proms premières have been, to put it mildly, an extremely mixed bag. By far the most excruciating of them was Venables Plays Bartók, a violin concerto of sorts by Philip Venables, given its first performance last Friday by Pekka Kuusisto with the BBC Symphony Orchestra, conducted by Sakari Oramo. As its title suggests, the piece incorporates music by Bartók, inspired by an episode in Venables’ life when, as a teenage violinist, he had a lesson with Rudolf Botta, playing to him a piece by Bartók. The lesson was recorded, and Venables’ rediscovery of the tape evidently led to a enormous burst of Proustian nostalgia.